A222876 Number of nX6 0..3 arrays with no more than floor(nX6/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

131, 399849, 1340197778, 4643150795564, 16364046520925461, 58365501277437736651, 209946033151635587197031, 760026285340633515213165141, 2765078298066978400951570461522

Offset: 1

Author

R. H. Hardin Mar 08 2013

Keywords

• nonn

Comments

Column 6 of A222878

Examples

			Some solutions for n=3
..0..0..0..0..1..2....0..0..0..0..1..2....0..0..0..0..1..2....0..0..0..0..1..0
..0..0..0..2..0..3....0..0..0..2..0..2....0..0..1..1..0..1....0..0..1..2..3..0
..0..2..1..3..0..3....1..2..1..0..3..1....2..0..3..1..0..3....0..2..1..3..2..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..27